EP0255636A1 - Capteur pour des ondes de chocs acoustiques - Google Patents

Capteur pour des ondes de chocs acoustiques Download PDF

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Publication number
EP0255636A1
EP0255636A1 EP87110410A EP87110410A EP0255636A1 EP 0255636 A1 EP0255636 A1 EP 0255636A1 EP 87110410 A EP87110410 A EP 87110410A EP 87110410 A EP87110410 A EP 87110410A EP 0255636 A1 EP0255636 A1 EP 0255636A1
Authority
EP
European Patent Office
Prior art keywords
coupling
sensor according
measuring
sensor
foils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87110410A
Other languages
German (de)
English (en)
Other versions
EP0255636B1 (fr
Inventor
Hans Rochling
Karl-Heinz Dipl.-Ing. Schlee (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0255636A1 publication Critical patent/EP0255636A1/fr
Application granted granted Critical
Publication of EP0255636B1 publication Critical patent/EP0255636B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
    • G01H3/005—Testing or calibrating of detectors covered by the subgroups of G01H3/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/80—Piezoelectric polymers, e.g. PVDF

Definitions

  • the invention relates to a sensor for acoustic shock wave pulses with a piezoelectric measuring film.
  • a sensor for acoustic shock wave pulses with a piezoelectric measuring film.
  • Such a sensor can be used in particular in lithotripsy, e.g. B. in kidney stone destruction using shock waves.
  • Such a sensor is known for example from DE-OS 34 37 976.
  • the shock wave sensor described there is used to measure the pressure amplitudes of the shock wave pulse in a propagation medium, preferably in water.
  • An important area of application for this is the measurement of the pressure at the focal point of focused shock waves.
  • This document does not go into how to set up the sensor outside of the propagation medium, for example in a lithotripsy application and so-called "dry coupling" of the patient.
  • difficulties which result from the fact that the measured values determined by the piezoelectric measuring foil are falsified by secondary causes, such as, for example, when the coupling medium water is circulated by means of pumps or by currents and waves of the propagation medium which arise during shock wave transmission, are not dealt with .
  • shock wave tubes in lithotripsy
  • the object of the invention is to design a sensor of the type mentioned in the introduction in such a way that defined measuring conditions are present regardless of its location. It should therefore be possible to measure the shock wave emitted by an independent source with the sensor.
  • the sensor should also be able to be coupled to such a source or inserted into a measuring basin. In particular, it should be suitable for dry coupling with a lithotripter.
  • the measuring foil is arranged between two coupling foils and that the space between the coupling foils is filled with a coupling medium for the transmission of the acoustic shock wave pulse.
  • the arrangement of the coupling foils or membranes on one side of the measuring sheet prevents currents or waves that propagate in the leading section from influencing the measuring sheet. It is advantageous if the measuring film is located in a closed capsule, so that waves in the propagation medium which run in the direction of the film plane are also kept away from the measuring film.
  • the sensor for example, in connection with a shock wave generator with so-called “dry coupling", i.e. H. without a patient tub, used in lithotripsy, it is located on the one hand during the measurement value determination between a closing membrane of the shock wave generator and the patient's skin or a coupling disk, if one is provided. In this case, different forces are exerted on the two coupling foils or coupling membranes.
  • the coupling medium is now in the sensor in pressure compensation with both sides of the measuring foil, d. H. If the same static pressure acts on the measuring film itself from both sides, an undesired bias of the piezoelectric measuring film and thus a measurement inaccuracy or even damage to the sensor is avoided.
  • the pressure compensation can e.g. B. can be created by a passage opening in a partition between the two coupling films.
  • a ring 1 which has a partition 3 in the middle of its inner edge and parallel to its two end faces.
  • the partition 3 is provided with a central opening 5, which is covered by a piezoelectric measuring film 7.
  • the diameter of the opening 5 and thus the passage area of the measuring film 7 for the shock wave pulse is, for. B. approx. 40 mm.
  • the ring 1 consists, for. B. from a material such as PVC or another plastic.
  • a PVDF film is preferably used as the measuring film 7.
  • the measuring film 7 is held by a clamping ring 8 over the central opening 5 so that the measuring film 7 covers the central opening 5 without creases.
  • conventional plastic screws 8a can be guided through the clamping ring 8 and screwed into the partition 3. Other fastenings can also be selected.
  • a first coupling film or coupling membrane 9 is clamped by a first retaining ring 11 by fastening means 11a.
  • the coupling film 9 is made, for example, of rubber, preferably silicone or EPDM rubber, with a thickness between 1 mm and 2 mm and a diameter of approximately 120 mm.
  • the coupling film 9 is clamped between the end face of the ring 1 and the retaining ring 11 in such a way that it covers the inside of the ring 1 without creases in a slightly tensioned state.
  • first coupling film 9 on the one hand and the partition 3 together with the measuring film 7 on the other on the one hand, a disk-like first intermediate space 13, which is delimited by the ring 1 at the edge.
  • the intermediate space 13 is provided with a coupling medium 14 for acoustic shock waves, e.g. B. filled with degassed distilled water. Oils such as castor oil can also be used as a filling.
  • the configuration of the first coupling film 9, the first retaining ring and the first intermediate space 13 is also provided in mirror image on the lower side of the sensor.
  • a second space 19 is formed, which is designed analogously to the upper chamber of the sensor. It is also filled with the coupling medium 14.
  • the non-clamped parts of the coupling films 9, 15 have z. B. a diameter of about 100 mm.
  • At least one of the coupling foils 9, 15 should consist of an optically transparent material in order to ensure observation from the outside.
  • the first intermediate space 13 is connected to the second intermediate space 19 via one or preferably a plurality of through openings 21 in the partition 3.
  • a pressure equalization between the first and the second intermediate space 13 or 19 takes place through the passage opening 21.
  • the sensor described can be used as a whole in the lead section of a shock wave generator of a lithotripter, and despite the currents and waves that occur within the lead section, there is no disruptive influence on the measuring film 7.
  • the sensor can also be placed between a coupling membrane (not shown) and a patient.
  • FIG. 2 shows a possible procedure for contacting the measuring foil 7.
  • the measuring foil 7, which extends beyond the outer edge of the clamping ring 8, is electrically connected via a clamping connection 25, which consists, for example, of a pressure plate held resiliently by a screw and a soldering tab 27 attached to it.
  • a two-pole measuring line 29 is soldered to the soldering lug and is guided outwards through a radial opening 30 in ring 1. It is important to ensure that a waterproof seal is made between the ring 1 and the measuring line 29.
  • FIG. 3 the same components are provided with the same reference symbols as in FIGS. 1 and 2.
  • the ring 1 also has an insertion opening approximately in its center, through which a short tube or socket 33 is guided, which is connected to the ring 1 in a watertight manner.
  • a hose for supplying the coupling medium can be connected to the connector 33. After filling the intermediate space 13, 19 with the coupling medium 14, the hose is removed and replaced by an end cap 35. The end cap 35 closes the insertion opening 31, so that the coupling medium 14 cannot mix with substances outside the sensor.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Measuring Fluid Pressure (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP87110410A 1986-07-30 1987-07-17 Capteur pour des ondes de chocs acoustiques Expired - Lifetime EP0255636B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625820 1986-07-30
DE3625820 1986-07-30

Publications (2)

Publication Number Publication Date
EP0255636A1 true EP0255636A1 (fr) 1988-02-10
EP0255636B1 EP0255636B1 (fr) 1990-04-25

Family

ID=6306333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110410A Expired - Lifetime EP0255636B1 (fr) 1986-07-30 1987-07-17 Capteur pour des ondes de chocs acoustiques

Country Status (4)

Country Link
US (1) US4803671A (fr)
EP (1) EP0255636B1 (fr)
JP (1) JPS63165545U (fr)
DE (1) DE3762459D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663374A1 (fr) * 1990-06-19 1991-12-20 Technomed Int Sa Procede et dispositif pour diminuer ou eliminer les perturbations causees par des bulles de gaz dans les generateurs d'onde de pression a liquide de couplage.
DE4102551A1 (de) * 1991-01-29 1992-07-02 Wolf Gmbh Richard Verfahren zum bestimmen der akustischen leistung fokussierender elektroakustischer wandler und vorrichtung zur durchfuehrung des verfahrens

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2200450B (en) * 1986-12-17 1990-10-24 Fuji Electric Co Ltd Apparatus for detecting resonant frequency of a vibratory mem ber
DE3808019A1 (de) * 1988-03-10 1989-09-21 Siemens Ag Ultraschall-sensor
DE3909558A1 (de) * 1989-03-23 1990-09-27 Dornier Medizintechnik Trefferkontrolle fuer die lithotripsie
US5072426A (en) * 1991-02-08 1991-12-10 Sonic Technologies Self-monitoring shock wave hydrophone
US5155708A (en) * 1991-02-26 1992-10-13 Bedi Ram L Acoustic wave sensor and method of making same
US5218576A (en) * 1992-05-22 1993-06-08 The United States Of America As Represented By The Secretary Of The Navy Underwater transducer
WO2001065615A2 (fr) * 2000-02-23 2001-09-07 Sri International Generateurs a polymeres electroactifs et commande biologique
DE102006013809B3 (de) * 2006-03-22 2007-09-06 Elster-Instromet Systems Gmbh Verfahren und Vorrichtung zur Messung von Betriebsdichte und/oder Betriebsschallgeschwindigkeit in einem gasförmigen Medium
WO2009006318A1 (fr) 2007-06-29 2009-01-08 Artificial Muscle, Inc. Transducteurs polymères électroactifs pour des applications de rétroaction sensorielle
US20090044420A1 (en) * 2007-08-16 2009-02-19 Hokwang Industries Co., Ltd. Light directing hand dryer
EP2239793A1 (fr) 2009-04-11 2010-10-13 Bayer MaterialScience AG Montage de film polymère électrique commutable et son utilisation
US8644115B2 (en) * 2011-01-04 2014-02-04 Postech Academy-Industry Foundation Hydrophone and pressure balancing device for using for hydrophone
US9553254B2 (en) 2011-03-01 2017-01-24 Parker-Hannifin Corporation Automated manufacturing processes for producing deformable polymer devices and films
EP2689284A4 (fr) 2011-03-22 2014-08-20 Bayer Ip Gmbh Système lenticulaire à actionneur à polymère électroactif
EP2828901B1 (fr) 2012-03-21 2017-01-04 Parker Hannifin Corporation Procédés de fabrication de rouleau à rouleau pour la production de dispositifs à polymère électroactif autoréparant
KR20150031285A (ko) 2012-06-18 2015-03-23 바이엘 인텔렉쳐 프로퍼티 게엠베하 연신 공정을 위한 연신 프레임
US9590193B2 (en) 2012-10-24 2017-03-07 Parker-Hannifin Corporation Polymer diode

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086531A1 (fr) * 1982-02-11 1983-08-24 Philips Patentverwaltung GmbH Dispositif pour la recherche par ultrasons
EP0179983A1 (fr) * 1984-10-17 1986-05-07 DORNIER SYSTEM GmbH Capteur d'ondes de choc

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1006324A (fr) * 1947-12-19 1952-04-22 Acec Palpeur par ondes élastiques
US4178577A (en) * 1978-02-06 1979-12-11 The United States Of America As Represented By The Secretary Of The Navy Low frequency hydrophone
US4433400A (en) * 1980-11-24 1984-02-21 The United States Of America As Represented By The Department Of Health And Human Services Acoustically transparent hydrophone probe
US4474184A (en) * 1982-09-27 1984-10-02 Advanced Technology Laboratories, Inc. Bubble trap for ultrasound scanhead
DE3328051A1 (de) * 1983-08-03 1985-02-14 Siemens AG, 1000 Berlin und 8000 München Einrichtung zum beruehrungslosen zertruemmern von konkrementen
US4653036A (en) * 1984-10-23 1987-03-24 The United States Of America As Represented By The Department Of Health And Human Services Transducer hydrophone with filled reservoir
US4734611A (en) * 1985-12-20 1988-03-29 Siemens Aktiengesellschaft Ultrasonic sensor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0086531A1 (fr) * 1982-02-11 1983-08-24 Philips Patentverwaltung GmbH Dispositif pour la recherche par ultrasons
EP0179983A1 (fr) * 1984-10-17 1986-05-07 DORNIER SYSTEM GmbH Capteur d'ondes de choc

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ACUSTICA, Band 58, Nr. 4, 1985, Seiten 215-222, Stuttgart, DE; M. MULLER et al.: "Einsatz einer breitbandigen Piezodrucksonde auf PVDF-Basis zur Untersuchung konvergierender Stosswellen in Wasser" *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2663374A1 (fr) * 1990-06-19 1991-12-20 Technomed Int Sa Procede et dispositif pour diminuer ou eliminer les perturbations causees par des bulles de gaz dans les generateurs d'onde de pression a liquide de couplage.
DE4102551A1 (de) * 1991-01-29 1992-07-02 Wolf Gmbh Richard Verfahren zum bestimmen der akustischen leistung fokussierender elektroakustischer wandler und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
EP0255636B1 (fr) 1990-04-25
JPS63165545U (fr) 1988-10-27
US4803671A (en) 1989-02-07
DE3762459D1 (de) 1990-05-31

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